Abstract: A padlock-type security seal that generally includes a U-shaped resilient shackle having two legs and a body having two apertures formed in a first end thereof for insertion of the shackle legs. The apertures are positioned in the first end of the body along two separate offset planes to provide a torsional force to the shackle upon insertion. The torsional force acts on locking elements of the legs to engage the body thereby preventing removal of the shackle. The locking elements are reversibly bent tangs formed at the ends of the shackle legs at offset angles with respect to the plane of the shackle. At least one of the shackle legs preferably includes a bent hinge portion for transferring the torsional force to the locking elements. A locking insert contained within the body engages at least one of the locking elements of the shackle legs under the torsional force to prevent removal of the shackle.