Abstract: In a computer system having a central processing unit (CPU) and a graphics processing unit (GPU), a system, method and computer program product for recovering a password used to encrypt a plaintext, including (a) generating N passwords on the CPU; (b) providing the N passwords to the GPU; (c) for each of the N passwords, calculating a transformed value from the password on the GPU, wherein the calculating is performed in parallel for all the N passwords provided to the GPU; (d) providing the N transformed values to the CPU; (e) at the CPU, testing the N transformed values for correctness; and (f) if none of the N transformed values are correct, repeating steps (a)-(e) for the next set of N passwords; (g) informing the user of a correct password.

Abstract: In a computer system having a central processing unit (CPU) and a graphics processing unit (GPU), a system, method and computer program product for recovering a password used to encrypt a plaintext, including (a) generating N passwords on the CPU; (b) providing the N passwords to the GPU; (c) for each of the N passwords, calculating a transformed value from the password on the GPU, wherein the calculating is performed in parallel for all the N passwords provided to the GPU; (d) providing the N transformed values to the CPU; (e) at the CPU, testing the N transformed values for correctness; and (f) if none of the N transformed values are correct, repeating steps (a)-(e) for the next set of N passwords; (g) informing the user of a correct password.

Abstract: A system, method and computer program product for recovering a password including, for each possible password to be tested, generating a periodicity unit based on a number of symbols in the password and a size of a chunk used by a one-way function to encrypt the password. The periodicity unit is substantially shorter than an input string, that includes replicated actual password used to encrypt the password. Based on the periodicity unit, using the one-way function, generating a control value for the periodicity unit. The control value is tested for a match with a control value generated from the actual password. An indication of a match is provided to a user.

Abstract: In a computer system having a central processing unit (CPU) and a graphics processing unit (GPU), a system, method and computer program product for recovering a password used to encrypt a plaintext, including (a) generating N passwords on the CPU; (b) providing the N passwords to the GPU; (c) for each of the N passwords, calculating a transformed value from the password on the GPU, wherein the calculating is performed in parallel for all the N passwords provided to the GPU; (d) providing the N transformed values to the CPU; (e) at the CPU, testing the N transformed values for correctness; and (f) if none of the N transformed values are correct, repeating steps (a)-(e) for the next set of N passwords; (g) informing the user of a correct password.

Abstract: An algorithm for recovering a key used to produce a cyphertext-plaintext pair includes (a) loading at least a portion of a probabilistic key table into memory; (b) distributing the keys in the portion of the probabilistic key table into a first plurality of buffer files that are in RAM.

Abstract: A system, method and computer program product for recovering a key used to produce a ciphertext document from a plaintext document, including, in the ciphertext document encrypted using an N-bit key, identifying location of an M-bit control value; converting the control value to an M-bit portion of a gamma that corresponds to (a) the ciphertext document and (b) the N-bit key; accessing a file that corresponds to the M-bit portion of the gamma, wherein the file includes approximately 2N-M keys that correspond to the M-bit portion of the gamma out of the 2N keys; testing the 2N-M keys using a cryptographic key validity function, until a valid key is found; and decrypting the ciphertext document using the valid key to produce the plaintext document. The keys in the file can be tested sequentially. The file can be requested from a server prior to accessing it, or can be local. The name of the file can include the M-bit portion of the gamma.