Docs / Encryption & encoding
DecryptSymmetric is an AMPscript function in the encryption & encoding category.
DecryptSymmetric(value, cipher, pwdKeyName, password, [saltKeyName, salt, ivKeyName, iv])
%%[ SET @enc = EncryptSymmetric("my secret", "aes", @null, "password1", @null, "8675309", @null, "0016CA1F4D0F8E45") ]%%
%%=DecryptSymmetric(@enc, "aes", @null, "password1", @null, "8675309", @null, "0016CA1F4D0F8E45")=%%
my secret
Output produced by AmpSend's AMPscript engine (validated against Salesforce's own test corpus) - not a hand-written result.
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DecryptSymmetric in the official AMPscript reference - or browse the official index of AMPscript functions for platform behavior and edge cases.