某司的广告Tracking：
https://xxxx.com/nc?ext=aHR0cHM6Ly9wcm8ubS5qZC5jb20vbWFsbC9hY3RpdmUvWlFiaEF2Z0pjeVF0V3VuZlRHckxGem41NWNuL2luZGV4Lmh0bWw_YmFiZWxDaGFubmVsPXR0dDIyJlBUQUc9MTcwNTEuOS4xJmlubmVyQW5jaG9yPTc4MjQzMDcmZm9jdXM9MiZhZF9vZD0x&log=JEPXoQ6MA3SX-3qL7Lq0ldORFeSy8tEJIqWN2jWKzDKW_OQswUERPioEWMGcFOAH_y9azZQfyIn_UdDZj2vhHynGgk3snupLQxu_j2U2WAxavW6s60Lz2NJHFIJWrvxnXpk-v-0NysHfTgxT4DTUIyiYMzd18TPrdJwLsXAtF-i9lwDL3kyGFl8rjFWcAMJEA-95ZAFf4tBFdtpu2eJDP2fPTSE1iUXGNJoE41LwsPMV4XraDvh3QlGG5zzzRqSzQOVUnmkxHtTYW1Qbwey3oqY7XSwSgMPw8M4Dadyd2PsMEdIF2jDJ9Xf0vtJhGczIFgpFeAfOw5pcOFNMhEu4F0UsZ6K6YuhGhLuWUlLJjNkBH_ukmC6EDj1UTK5fUw1aa165kJt4eyGQgiGbxvJwZ5KaD4woUZREcHsMnH7oJdSzqdIKnTz8GiPAL_1l8RT5J2ayYJrtZ-0VMgTD3Hx2Cy8WEE48OATmDgtwDLjm6HSMMLXQHKiqU0MiyLgLJLpu4_6vNhgRKQJQ9wwTURCMXScJenwcAZ4nhEtIQ5sH-otU2VC4gWEagcU7fF4SSadHmlDTUX-nDhKOS92BrXOq-dQ4l_YPDKw-4fkZNdj4utNW8Uqvfc4j8VtDgFDyqXyS&v=404&kms_v=209_a1



微信的：
https://mp.weixin.qq.com/s?src=11&timestamp=1605061801&ver=2699&signature=UXr341dEy1ACNraSFZhITnKQDvo2NxLWT*eTaGKjIhoz5qrq0ZSkgjLwIuOxjMWwWeuFvtBnhHWfsta732ZAipipSxpaZKSIMpolZzEm-mBLJKfuMxklQeGGsJ2CDlGe&new=1

signature:UXr341dEy1ACNraSFZhITnKQDvo2NxLWT*eTaGKjIhoz5qrq0ZSkgjLwIuOxjMWwWeuFvtBnhHWfsta732ZAipipSxpaZKSIMpolZzEm-mBLJKfuMxklQeGGsJ2CDlGe

理论上来说，只是签名的话，没必要这么长，肯定是可以反解密的。
大概用什么算法？
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